etymon

et·y·mon

noun

pl.-·mons· or -·ma

an earlier form of a word, as at an earlier period in the development of a language: in this dictionary etymons are shown in italic type within the etymologies (Ex.: Old English “eage” is the etymon of Modern English “eye”)

a word or morpheme from which derivatives or compounds have developed

Origin of etymon

Classical Latin from Classical Greek etymon, literal sense of a word, etymology, neuter of etymos, true from Indo-European an unverified form seto- from base an unverified form es-, to be from source is, Classical Latin sum, est